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Efficacy of Vitamin D in Post-Stroke Cognitive Impairment (ViD-PSCI)

20 augustus 2026 bijgewerkt door: Suzhou Municipal Hospital of Anhui Province

Efficacy and Immunological Mechanisms of Vitamin D Supplementation for Post-Stroke Cognitive Impairment: A Randomized Controlled Trial

Post-stroke cognitive impairment (PSCI) is a prevalent and debilitating sequela of stroke, posing a significant burden on patients and healthcare systems. Emerging evidence suggests that Vitamin D deficiency is associated with an increased risk of cognitive decline and neuroinflammation. However, the therapeutic potential and underlying immunological mechanisms of Vitamin D supplementation in PSCI remain unclear.

This study is a randomized, double-blind, placebo-controlled trial designed to evaluate the efficacy of Vitamin D supplementation in improving cognitive function among patients with PSCI. The primary objective is to determine whether high-dose Vitamin D administration can significantly enhance cognitive performance compared to a placebo group. Secondary objectives include assessing the effects on serum inflammatory markers (such as IL-6, TNF-α, and IL-10) and regulatory T cells (Tregs), thereby exploring the potential immune-modulatory pathways.

Eligible participants will be randomly assigned to receive either oral Vitamin D (e.g., 5000 IU/day) or an identical placebo for a duration of [e.g., 6 months]. Cognitive function will be assessed using standardized neuropsychological tests, including the Montreal Cognitive Assessment (MoCA) and Mini-Mental State Examination (MMSE). Blood samples will be collected at baseline and post-intervention to measure changes in immune-related biomarkers.

The findings of this trial will provide critical evidence regarding the role of Vitamin D as a potential adjunctive therapy for PSCI and elucidate the connection between vitamin D status and post-stroke immune regulation.

Studie Overzicht

Toestand

Actief, niet wervend

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

Background and Rationale:

Post-stroke cognitive impairment (PSCI) is a prevalent complication that severely impacts patient rehabilitation and quality of life. Recent studies suggest that Vitamin D deficiency is highly prevalent in stroke patients and is closely associated with neuroinflammation and cognitive decline. However, high-quality clinical evidence regarding the efficacy of Vitamin D supplementation in PSCI and its underlying immunological mechanisms remains limited. This study aims to bridge this gap by providing clinical and mechanistic evidence.

Study Design and Participants:

This is a prospective, randomized, double-blind, placebo-controlled clinical trial. Eligible participants are adult patients diagnosed with acute ischemic stroke complicated by cognitive impairment within 7 days of onset. Patients with severe hepatic or renal dysfunction, or those already receiving high-dose Vitamin D therapy, will be excluded.

Intervention:

Eligible participants will be randomly assigned (1:1) to either the intervention group or the control group.

Intervention Group: Will receive oral Vitamin D2 capsules (5000 IU/day) for 6 months.

Control Group: Will receive identical placebo capsules for 6 months. Both patients and investigators will be blinded to the group assignments.

Outcome Assessments:

Primary Outcome: Changes in cognitive function from baseline to 6 months, assessed using the Montreal Cognitive Assessment (MoCA) and Mini-Mental State Examination (MMSE).

Secondary Outcomes: Changes in serum immune-inflammatory markers, including IL-6, TNF-α, IL-10, and the proportion of regulatory T cells (Tregs), measured via ELISA and flow cytometry at baseline and 6 months.

Sample Size and Statistical Analysis:

Based on a power calculation considering a 20% dropout rate, a total of 300 participants will be enrolled. All statistical analyses will be performed using SPSS software. Continuous variables will be compared using t-tests or Mann-Whitney U tests, while categorical variables will be analyzed using Chi-square tests. A p-value < 0.05 will be considered statistically significant.

Studietype

Ingrijpend

Inschrijving (Geschat)

300

Fase

  • Niet toepasbaar

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studie Locaties

  • China
    • Anhui
      • Suzhou, Anhui, China, 234000
        • Suzhou Hospital Affiliated to Anhui Medical University

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

  • Volwassen
  • Oudere volwassene

Accepteert gezonde vrijwilligers

Nee

Beschrijving

Inclusion Criteria:

  • Age: Aged 18 to 80 years (inclusive).
  • Diagnosis: First-ever ischemic or hemorrhagic stroke, confirmed by brain CT or MRI within 1 week of onset.
  • Time Window: Post-stroke duration between 3 months and 24 months.
  • Cognitive Status: Presence of cognitive impairment, defined as a Montreal Cognitive Assessment (MoCA) score < 26 (or your specific cutoff) at screening.
  • Stability: Clinically stable condition, without recurrent stroke or transient ischemic attack (TIA) in the past 3 months.
  • Consent: Ability to provide written informed consent by the participant or their legal representative.
  • Compliance: Willingness and ability to comply with the study protocol and follow-up visits.

Exclusion Criteria:

  • Severe Disability: Pre-morbid or current modified Rankin Scale (mRS) score > 3.
  • Other CNS Diseases: Presence of other neurological diseases that could cause cognitive decline (e.g., Parkinson's disease, epilepsy, brain tumor, or severe traumatic brain injury).
  • Psychiatric Disorders: History of major psychiatric disorders (e.g., schizophrenia, severe depression) that may interfere with cognitive testing.
  • Vitamin D Status: Known history of hypercalcemia, hypercalciuria, or sarcoidosis; or current use of vitamin D supplements (>800 IU/day) or calcium supplements within the past 3 months.
  • Severe Comorbidities: Severe dysfunction of heart, liver, or kidney (e.g., ALT/AST > 3x ULN, eGFR < 30 mL/min/1.73m²).
  • Life Expectancy: Life expectancy less than 6 months due to malignant tumors or other terminal illnesses.
  • Allergy: Known allergy or hypersensitivity to vitamin D or any components of the study formulation.
  • Participation: Participation in another interventional clinical trial within the past 30 days.

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Behandeling
  • Toewijzing: Gerandomiseerd
  • Interventioneel model: Parallelle opdracht
  • Masker: Verviervoudigen

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Experimenteel: Vitamin D Supplementation Group

Intervention Group:

Participants will receive oral Vitamin D2 (Ergocalciferol) soft capsules at a dosage of 5,000 IU once daily for a period of 6 months.
Voedingssupplement: Vitamin D2 capsules
Participants in the intervention group will receive oral soft capsules containing Vitamin D₂ (Ergocalciferol) 5000 IU, taken once every 5 days (one capsule per administration) for a period of 6 months. The active capsules are identical in appearance, packaging, and taste to the placebo capsules to maintain blinding.
Placebo-vergelijker: Placebo Group

Placebo Group:

Participants will receive oral placebo soft capsules that are identical in appearance, packaging, and taste to the Vitamin D2 capsules. The placebo will be administered once daily for a period of 6 months.
Voedingssupplement: Placebo Soft Capsules (Vitamin D₂-matched placebo)

Participants in the placebo group will receive oral soft capsules that are identical in appearance, color, size, taste, and packaging to the active Vitamin D₂ (5000 IU) capsules. The placebo capsules contain no active Vitamin D₂ ingredient and are filled with the same excipient matrix (e.g., refined vegetable oil / medium-chain triglycerides) as the active capsules, without added calcium or other active substances that could affect outcomes.

Administration: One capsule is taken orally once every 5 days (same dosing frequency as the intervention group).

Duration: The intervention period lasts 6 months (approximately 36 total doses, aligned with the active group on the same calendar schedule).

Blinding: The placebo capsules are identical in labeling, packaging, odor, and taste to the active capsules. A third-party will handle packaging and coding to maintain double-blinding among researchers, participants, and outcome assessors.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Change in Montreal Cognitive Assessment (MoCA) Score
Tijdsspanne: 6 months
The change in Montreal Cognitive Assessment (MoCA) score from baseline to 6 months post-randomization.
6 months
Change in Regulatory T Cells (Tregs) Proportion
Tijdsspanne: 6 months
The change in the proportion of peripheral blood regulatory T cells (Tregs) from baseline to 6 months post-randomization, assessed via flow cytometry.
6 months

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Change in Serum Inflammatory Markers
Tijdsspanne: 6 months
The change in serum levels of inflammatory markers, including Interleukin-6 (IL-6), Tumor Necrosis Factor-alpha (TNF-α), and Interleukin-10 (IL-10), from baseline to 6 months post-randomization.
6 months
Change in Serum 25-Hydroxyvitamin D Level
Tijdsspanne: 6 months
The change in serum 25-hydroxyvitamin D [25(OH)D] concentration from baseline to 6 months post-randomization.
6 months

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

Suzhou Municipal Hospital of Anhui Province

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Werkelijk)

1 januari 2026

Primaire voltooiing (Geschat)

1 februari 2028

Studie voltooiing (Geschat)

1 juni 2028

Studieregistratiedata

Eerst ingediend

11 augustus 2026

Eerst ingediend dat voldeed aan de QC-criteria

11 augustus 2026

Eerst geplaatst (Werkelijk)

17 augustus 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

21 augustus 2026

Laatste update ingediend die voldeed aan QC-criteria

20 augustus 2026

Laatst geverifieerd

1 augustus 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • AHMU-SZNE-2026-001
  • 2025byzd011 (Ander subsidie-/financieringsnummer: Bengbu Medical University)

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

NEE

Beschrijving IPD-plan

No sharing is planned due to patient privacy and ethical committee restrictions.

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Nee

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

Deze informatie is zonder wijzigingen rechtstreeks van de website clinicaltrials.gov gehaald. Als u verzoeken heeft om uw onderzoeksgegevens te wijzigen, te verwijderen of bij te werken, neem dan contact op met register@clinicaltrials.gov. Zodra er een wijziging wordt doorgevoerd op clinicaltrials.gov, wordt deze ook automatisch bijgewerkt op onze website .

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